package com.ypj.community.service;

import com.ypj.community.dao.LoginTicketMapper;
import com.ypj.community.dao.UserMapper;
import com.ypj.community.domain.LoginTicket;
import com.ypj.community.domain.User;
import com.ypj.community.util.CommunityConstant;
import com.ypj.community.util.CommunityUtil;
import com.ypj.community.util.MailClient;
import com.ypj.community.util.RedisKeyUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Service;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

import javax.annotation.Resource;
import java.util.*;
import java.util.concurrent.TimeUnit;

@Service
public class UserService implements CommunityConstant{

    @Resource
    private UserMapper userMapper;

    @Autowired
    private MailClient mailClient;

//    @Resource
//    private LoginTicketMapper loginTicketMapper;

    @Autowired
    private TemplateEngine templateEngine;

    @Value("${community.path.domain}")
    private String domain;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private RedisTemplate redisTemplate;


    public User findUserById(Integer id){
//        return userMapper.selectById(id);
        User user=getCache(id);
        if (user==null){
            user=initCache(id);
        }
        return user;
    }

    public Map<String, Object> register(User user) {
        Map<String, Object> map = new HashMap<>();

        // 空值处理
        if (user == null) {
            throw new IllegalArgumentException("参数不能为空!");
        }
        if (StringUtils.isBlank(user.getUsername())) {
            map.put("usernameMsg", "账号不能为空!");
            return map;
        }
        if (StringUtils.isBlank(user.getPassword())) {
            map.put("passwordMsg", "密码不能为空!");
            return map;
        }
        if (StringUtils.isBlank(user.getEmail())) {
            map.put("emailMsg", "邮箱不能为空!");
            return map;
        }

        // 验证账号
        User u = userMapper.selectByName(user.getUsername());
        if (u != null) {
            map.put("usernameMsg", "该账号已存在!");
            return map;
        }

        // 验证邮箱
        u = userMapper.selectByEmail(user.getEmail());
        if (u != null) {
            map.put("emailMsg", "该邮箱已被注册!");
            return map;
        }

        // 注册用户
        user.setSalt(CommunityUtil.generateUUID().substring(0, 5));
        user.setPassword(CommunityUtil.md5(user.getPassword() + user.getSalt()));
        user.setType(0);
        user.setStatus(0);
        user.setActivationCode(CommunityUtil.generateUUID());
        user.setHeaderUrl(String.format("http://images.nowcoder.com/head/%dt.png", new Random().nextInt(1000)));
        user.setCreateTime(new Date());
        userMapper.insertUser(user);
        user=userMapper.selectByName(user.getUsername());
        // 激活邮件
        Context context = new Context();
        context.setVariable("email", user.getEmail());
        // http://localhost:8080/community/activation/101/code
        String url = domain + contextPath + "/activation/" + user.getId() + "/" + user.getActivationCode();
        context.setVariable("url", url);
        String content = templateEngine.process("/mail/activation", context);
        mailClient.sendMail(user.getEmail(), "激活账号", content);

        return map;
    }
    public Integer activation(Integer userId,String code){
        User user=userMapper.selectById(userId);
        if (user.getStatus()==1){
            return ACTIVATION_REPEATE;
        }else if (user.getActivationCode().equals(code)){
            userMapper.updateStatus(userId,1);
            clearCache(userId);
            return ACTIVATION_SUCCESS;
        }else{
            return ACTIVATION_FAILURE;
        }
    }
    public Map<String,Object> login(String username,String password,Integer expiredSeconds){
        Map<String,Object> map=new HashMap<>();
        if (StringUtils.isBlank(username)){
            map.put("usernameMsg","账号不能为空");
            return map;
        }
        if (StringUtils.isBlank(password)){
            map.put("passwordMsg","密码不能为空");
            return map;
        }
        //验证账号
        User user=userMapper.selectByName(username);
        if (user==null){
            map.put("usernameMsg","该账号不存在");
            return map;
        }
        //验证状态
        if (user.getStatus()==0){
            map.put("usernameMsg","该账号未激活");
            return map;
        }
        //验证密码
        password=CommunityUtil.md5(password+user.getSalt());
        if (!user.getPassword().equals(password)){
            map.put("passwordMsg","密码错误");
            return map;
        }
        //生成登录凭证
        LoginTicket loginTicket=new LoginTicket();
        loginTicket.setUserId(user.getId());
        loginTicket.setTicket(CommunityUtil.generateUUID());
        loginTicket.setStatus(0);
        loginTicket.setExpired(new Date(System.currentTimeMillis()+expiredSeconds*1000));
//        loginTicketMapper.insertLoginTicket(loginTicket);
        String redisKey= RedisKeyUtil.getTicketKey(loginTicket.getTicket());
        redisTemplate.opsForValue().set(redisKey,loginTicket);
        map.put("ticket",loginTicket.getTicket());
        return map;
    }
    //退出
    public void logout(String ticket){
//        loginTicketMapper.updateStatus(ticket,1);
        String redisKey=RedisKeyUtil.getTicketKey(ticket);
        LoginTicket loginTicket=(LoginTicket) redisTemplate.opsForValue().get(redisKey);
        loginTicket.setStatus(1);
        redisTemplate.opsForValue().set(redisKey,loginTicket);
    }

    public LoginTicket findLoginTicket(String ticket){
//        return loginTicketMapper.selectByTicket(ticket);
        String redisKey=RedisKeyUtil.getTicketKey(ticket);
        return (LoginTicket)redisTemplate.opsForValue().get(redisKey);
    }
    public int updateHeader(Integer userId,String headerUrl){
//        return userMapper.updateHeader(userId,headerUrl);
        int rows=userMapper.updateHeader(userId,headerUrl);
        clearCache(userId);
        return rows;
    }
    //修改密码
    public Map<String,Object> updatePassword(Integer userId,String oldPassword,String newPassword){
        Map<String,Object> map=new HashMap<>();
        User user=userMapper.selectById(userId);
        if (!user.getPassword().equals(CommunityUtil.md5(oldPassword+user.getSalt()))){
            map.put("oldPasswordMsg","密码错误");
            return map;
        }
        newPassword=CommunityUtil.md5(newPassword+user.getSalt());
        userMapper.updatePassword(userId,newPassword);
        clearCache(userId);
        return map;
    }

    public User findUserByName(String username){
        return userMapper.selectByName(username);
    }
    //1.优先从缓存中取值
    private User getCache(int userId){
        String redisKey=RedisKeyUtil.getUsertKey(userId);
        return (User) redisTemplate.opsForValue().get(redisKey);
    }
    //2.取不到时初始化缓存数据
    private User initCache(int userId){
        User user=userMapper.selectById(userId);
        String redisKey=RedisKeyUtil.getUsertKey(userId);
        redisTemplate.opsForValue().set(redisKey,user,3600, TimeUnit.SECONDS);
        return user;
    }
    //3.数据变更时i清楚缓存数据
    private void clearCache(int userId){
        String redisKey=RedisKeyUtil.getUsertKey(userId);
        redisTemplate.delete(redisKey);
    }
    public Collection<? extends GrantedAuthority> getAuthorities(int userId){
        User user=this.findUserById(userId);
        List<GrantedAuthority> list=new ArrayList<>();
        list.add(new GrantedAuthority() {
            @Override
            public String getAuthority() {
                switch (user.getType()){
                    case 1:return AUTHORITY_ADMIN;
                    case 2:return AUTHORITY_MODERATOR;
                    default:return AUTHORITY_USER;
                }
            }
        });
        return list;
    }
}
